Corrosion preventing composition



Patented Feb. 23, 1932 nrsraroror' COLUMBIA CORROSION PREVENTINGooiurosrrron No Drawing. Application fiIed'May 26, 1927, Serial Thisinvention relates to compositions for preventing corrosion on metalsurfaces and more particularly to such compositions for use inpreventing after-corrosions in fire 5 arms.

The corrosion of metal surfaces and particularly that known asafter-corrosion in fire arms has been a serious problem and nosatisfactory method or composition for eliminat- 1( ing such corrosionhas been obtained to date, even though repeated efforts have been madewith this end in view. See for example Technical Paper No. 188 of theBureau of Mines. Many of the compositions which the 15 prior art hassuggested for these purposes fail utterly to accomplish the end sought.To

a large extent the after-corrosion in fire arms appears to be due to thedeposition of salts, such as potassium chloride, probably formed bydecomposition of the potassium chlorate used in the powder or otherexplosive. The salt is deposited as the result of such decomposition andleads to corrosion, particularly in humid atmospheres.

Among the objects of the present inven tion are the production of acomposition which is economical to manufacture but which will preventthe corrosion ofsuch metal surfaces, and particularly theafter-corrosion of fire arms.

Other objects and advantages will appear from the more detaileddescription set forth below, it being understood, however, that suchmore detailed description is given by way of illustration and not by wayof limitation, since various changes may be made therein by thoseskilled in the art without departing from the scope and spirit of thisinvention.

Primarily it has been found that a phenol such as carbolic acid acts toeliminate thecorrosive action on metal surfaces, and particularly thatknown as after-corrosion in fire arms. The phenol is desirably used witha base of oily character such base being an unctuous material suchasvegetable, mineral and animal or fish oils, whetherin the liquid orsolid or semi-solid state. The base such as an oil is mixed with thephenol in "any desired way, either at atmospheric temperatures or highertemperatures, the latter not being centages of pending upon'the amountand caliber.

No. 194,546. Renewed January 22, 1930.-

is not necessary." I Ithas been found that compositions to preventcorrosion and particularly after-corrosion varies with the perphenolpresent with the oil, such ability varying from non-effectiveness withZero per cent of phenol to complete effectiveness with definitepercentages ofphenol, de-

nature. of -theI salt or other corrosive element to bedissolved. g

The compositions made inaccordance with this invention are used in thefollowing man.- ner. The steel or other surface carrying the depositedsalt or other corrosive agent is p or until the next application ofthesalt is to be made on thesteel surface. The oily material' may or maynotbe Y removed at this time at theelection of the user. It isundesirable to wipe off or other wise remove the composition"immediatelyafter it has beenapplied, as more desirable results are obtained byprolonged contact between the metal surface and the composition. Themaximum complete efi'ectiveness is obtained when the solution isappliedto all of the metal'surface that has been exposed to the salt, and thenleft there to permit its action toensue. This action takeslplaceatordinary atmospheric temperatures, and appears to. be assisted ratherthan retarded by the presenceof moisture. It should be noted thatafter-corrosion of fire fire arm, for example, applied with l abristlebrush of appropriate This. of application is the use of a cloth thereason that the oil into theshoulder of the lands and grooves of a riflefire arm, which result may not be obtained by the use of apatch. Whenknown as a patch for bristle brush delivers the formed at the junctionthe ability or an. s

l liethe steel or other metal surface to be treatedis to be stored forlong periods, such, for ex-' ample, as from two Weeks to several years,it isdesirable to use a base in the form of a grease, rather than alight oil, the latter being subject to evaporation.

As a general'rule a treatment lasting for V 24 hours is suflicient forcomplete absorption of the salts and the composition may be res movedafter this time Without fear of corro-. sive action due to such :salts,taking place The following examples will illustrate some of the specificcompositions that may be used for, these purposes.

50 grains of phenol crystals are added to 1 ounce of sperm'oil. Thesolution is readily obtained, particularly at approximately 150 2Q F.This composition maythenbe applied to steelor other metal surfaces. Forexample, in fire arms, it-Will serve to prevent the corrosion of thesteel,:due to the potassium chloride deposited on the steel under heatand pressure, which potassium chloride may be derived from the potassiumchlorate in the primer. The application of this solu-' tionto thesteelsurface upon which the salt has been deposited completely preventsrcor- 3 rosion'byfsuoh salt.. Theoil in the composition also preventsoxidation or COIIOSlOIl from ordinary causes. 7 I

3 further preferred composition is made asfollows: r r

' grams of liquid phenol U. S. P. having acontent. of notlessthan 87per-cent pure phenol is mixed with 900.0. .c. of lard oil. Gommixture isobtained readily Without heat. This composition may be used in themanner setforth above. o r

-Having thus set forth: my invention, I claimzr i 1. A compositionpreventing [corrosion on metalsurfaceswhich consists of carbolic acidand lard oil in proportion suflioient to prevent after corrosion infirearms. e V

2. A composition 'preventing after corroslon 'infirearmsjwhich consistsof 30 grams liquid phenol U. S. P. containing not less than 87 per centpure phenol and 900 c. c.of lardoil. a V v r m 3. Themethod ofpre'ventingafter corrosion 1n fire arms Whichv comprises applyingthereto a composition co taining phenol and lard oil. 7. I A 1; 111testimony whereof I hereunto aflix my" G0 signature.v Q

J. 11' MoCAMBRIDGE.

